History Channel's hit drama "Vikings" began with Ragnar Lothbrok and his brother, Rollo, defeating dozens of warriors in a bloody battle. But as the series ends its freshman season Sunday, the brothers probably won't be standing together.

"You don't know whose side Rollo is on," Travis Fimmel, who plays Ragnar, told me earlier this season, adding that the final episodes of the season were his favorites. "There's a brotherly rivalry, you know what I mean? And great conflicts."

As Ragnar conquered the sea, raided the English and battled with his Earl--basically becoming the legend we know today--jealousy has been simmering within Rollo (Clive Standen). In "All Change," debuting at 9 p.m. CT April 28, he is presented with an opportunity to become "a great man" himself.

Ragnar takes a small group with him on a mission for King Horik (Donal Logue). He is sent to Gotaland (modern day Sweden) to resolve a land dispute between Horik and the area's leader, Jarl Borg (Thorbjorn Harr). As you can see in the video clips here, Jarl Borg plays Rollo against his brother just as Earl Haraldson (Gabriel Byrne) did earlier in the season.

We know how that worked out, but this time Rollo might be ready to turn on Ragnar.

"I think my character's written a bit more intelligent and he's got a lot bigger picture in his mind than Rollo does," Fimmel said. "He wants to die for a reason. He doesn't want to die just for the sake of being a warrior."

"Ragnar's not proud of himself," as Rollo seems to be, Fimmel continued. "So he wants to do a lot more before he succumbs."

Ragnar's not going to die any time soon, it seems. History has renewed the series from Michael Hirst for a 10-episode second season--one more episode than the first. It will film later this year to air in 2014.

Are you ready for the finale? What have you thought of the first season of History's "Vikings?" Check out another Jarl borg-Rollo clip below (Don't Harr and Standen look like they could be brothers?), and a general teaser that shows Ragnar's wife, Lagertha (Katheryn Winnick), back in their village of Kattegat, where a plague rages.

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